diff --git a/dlls/qcap/avimux.c b/dlls/qcap/avimux.c
index c3dbf71d2da..fe4add83b7c 100644
--- a/dlls/qcap/avimux.c
+++ b/dlls/qcap/avimux.c
@@ -1110,9 +1110,12 @@ static HRESULT source_query_interface(struct strmbase_pin *iface, REFIID iid, vo
     return S_OK;
 }
 
-static HRESULT source_query_accept(struct strmbase_pin *base, const AM_MEDIA_TYPE *amt)
+static HRESULT source_query_accept(struct strmbase_pin *iface, const AM_MEDIA_TYPE *mt)
 {
-    FIXME("(%p) stub\n", base);
+    if (!IsEqualGUID(&mt->majortype, &GUID_NULL) && !IsEqualGUID(&mt->majortype, &MEDIATYPE_Stream))
+        return S_FALSE;
+    if (!IsEqualGUID(&mt->subtype, &GUID_NULL) && !IsEqualGUID(&mt->subtype, &MEDIASUBTYPE_Avi))
+        return S_FALSE;
     return S_OK;
 }
 
diff --git a/dlls/qcap/tests/avimux.c b/dlls/qcap/tests/avimux.c
index 3f43ff569cf..70575281cee 100644
--- a/dlls/qcap/tests/avimux.c
+++ b/dlls/qcap/tests/avimux.c
@@ -468,6 +468,7 @@ static void test_media_types(void)
     pmt->bFixedSizeSamples = FALSE;
     pmt->bTemporalCompression = TRUE;
     pmt->lSampleSize = 123;
+    pmt->formattype = FORMAT_VideoInfo;
     hr = IPin_QueryAccept(pin, pmt);
     ok(hr == S_OK, "Got hr %#x.\n", hr);
 
@@ -476,7 +477,7 @@ static void test_media_types(void)
     ok(hr == S_OK, "Got hr %#x.\n", hr);
     pmt->majortype = MEDIATYPE_Video;
     hr = IPin_QueryAccept(pin, pmt);
-    todo_wine ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
     pmt->majortype = MEDIATYPE_Stream;
 
     pmt->subtype = GUID_NULL;
@@ -484,7 +485,7 @@ static void test_media_types(void)
     ok(hr == S_OK, "Got hr %#x.\n", hr);
     pmt->subtype = MEDIASUBTYPE_RGB8;
     hr = IPin_QueryAccept(pin, pmt);
-    todo_wine ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
     pmt->subtype = MEDIASUBTYPE_Avi;
 
     CoTaskMemFree(pmt);